For those of you who haven't heard of this position, it is a derivative of Cowgirl. Sybian is a machine used by women for erotic self-stimulation. Its greatest advantage is that it has detachable dildos that vibrate and rotate, thus stimulating the g-spot and clitoris simultaneously.
Now, a real person substitutes wonderfully for the Sybian! They simply lie back on an ottoman that's high enough for them to be ridden without the receiver being in too deep of a squat. (A positional aid such as Liberator's Wedge Ramp Combo will also do marvellously.)
Because of the receiver’s superior positioning, they have all the control needed to comfortably bounce, rock, rotate, or slide. It is clear from the animation that the legs will get a workout; however, Sybian is conducive to sexual endurance – the receiver can hover above the giver as they trusts upward, or receive support from the giver's hands holding them up by the thighs or buttocks.